ym2612.h 6.3 KB

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  1. /*
  2. header file for software emulation for FM sound generator
  3. */
  4. #ifndef _H_FM_FM_
  5. #define _H_FM_FM_
  6. /* compiler dependence */
  7. #ifndef UINT8
  8. typedef unsigned char UINT8; /* unsigned 8bit */
  9. typedef unsigned short UINT16; /* unsigned 16bit */
  10. typedef unsigned int UINT32; /* unsigned 32bit */
  11. #endif
  12. #ifndef INT8
  13. typedef signed char INT8; /* signed 8bit */
  14. typedef signed short INT16; /* signed 16bit */
  15. typedef signed int INT32; /* signed 32bit */
  16. #endif
  17. #if 1
  18. /* struct describing a single operator (SLOT) */
  19. typedef struct
  20. {
  21. INT32 *DT; /* #0x00 detune :dt_tab[DT] */
  22. UINT8 ar; /* #0x04 attack rate */
  23. UINT8 d1r; /* #0x05 decay rate */
  24. UINT8 d2r; /* #0x06 sustain rate */
  25. UINT8 rr; /* #0x07 release rate */
  26. UINT32 mul; /* #0x08 multiple :ML_TABLE[ML] */
  27. /* Phase Generator */
  28. UINT32 phase; /* #0x0c phase counter | need_save */
  29. UINT32 Incr; /* #0x10 phase step */
  30. UINT8 KSR; /* #0x14 key scale rate :3-KSR */
  31. UINT8 ksr; /* #0x15 key scale rate :kcode>>(3-KSR) */
  32. UINT8 key; /* #0x16 0=last key was KEY OFF, 1=KEY ON */
  33. /* Envelope Generator */
  34. UINT8 state; /* #0x17 phase type: EG_OFF=0, EG_REL, EG_SUS, EG_DEC, EG_ATT | need_save */
  35. UINT16 tl; /* #0x18 total level: TL << 3 */
  36. INT16 volume; /* #0x1a envelope counter | need_save */
  37. UINT32 sl; /* #0x1c sustain level:sl_table[SL] */
  38. /* asm relies on this order: */
  39. union {
  40. struct {
  41. UINT32 eg_pack_rr; /* #0x20 1 (release state) */
  42. UINT32 eg_pack_d2r; /* #0x24 2 (sustain state) */
  43. UINT32 eg_pack_d1r; /* #0x28 3 (decay state) */
  44. UINT32 eg_pack_ar; /* #0x2c 4 (attack state) */
  45. };
  46. UINT32 eg_pack[4];
  47. };
  48. UINT8 ssg; /* 0x30 SSG-EG waveform */
  49. UINT8 ssgn;
  50. UINT16 ar_ksr; /* 0x32 ar+ksr */
  51. UINT16 vol_out; /* 0x34 current output from EG (without LFO) */
  52. UINT16 vol_ipol; /* 0x36 interpolator memory */
  53. } FM_SLOT;
  54. typedef struct
  55. {
  56. FM_SLOT SLOT[4]; /* four SLOTs (operators) */
  57. UINT8 ALGO; /* +00 algorithm */
  58. UINT8 FB; /* feedback shift */
  59. UINT8 pad[2];
  60. INT32 op1_out; /* op1 output for feedback */
  61. INT32 mem_value; /* +08 delayed sample (MEM) value */
  62. INT32 pms; /* channel PMS */
  63. UINT8 ams; /* channel AMS */
  64. UINT8 kcode; /* +11 key code: */
  65. UINT8 fn_h; /* freq latch */
  66. UINT8 pad2;
  67. UINT32 fc; /* fnum,blk:adjusted to sample rate */
  68. UINT32 block_fnum; /* current blk/fnum value for this slot (can be different betweeen slots of one channel in 3slot mode) */
  69. /* LFO */
  70. UINT8 AMmasks; /* AM enable flag */
  71. UINT8 pad3[3];
  72. } FM_CH;
  73. typedef struct
  74. {
  75. int clock; /* master clock (Hz) */
  76. int rate; /* sampling rate (Hz) */
  77. double freqbase; /* 08 frequency base */
  78. UINT8 address; /* 10 address register | need_save */
  79. UINT8 status; /* 11 status flag | need_save */
  80. UINT8 mode; /* mode CSM / 3SLOT */
  81. UINT8 flags; /* operational flags */
  82. int TA; /* timer a */
  83. int TAC; /* timer a maxval */
  84. int TAT; /* timer a ticker | need_save */
  85. UINT8 TB; /* timer b */
  86. UINT8 pad2[3];
  87. int TBC; /* timer b maxval */
  88. int TBT; /* timer b ticker | need_save */
  89. /* local time tables */
  90. INT32 dt_tab[8][32];/* DeTune table */
  91. } FM_ST;
  92. /***********************************************************/
  93. /* OPN unit */
  94. /***********************************************************/
  95. /* OPN 3slot struct */
  96. typedef struct
  97. {
  98. UINT32 fc[3]; /* fnum3,blk3: calculated */
  99. UINT8 fn_h; /* freq3 latch */
  100. UINT8 kcode[3]; /* key code */
  101. UINT32 block_fnum[3]; /* current fnum value for this slot (can be different betweeen slots of one channel in 3slot mode) */
  102. } FM_3SLOT;
  103. /* OPN/A/B common state */
  104. typedef struct
  105. {
  106. FM_ST ST; /* general state */
  107. FM_3SLOT SL3; /* 3 slot mode state */
  108. UINT32 pan; /* fm channels output mask (bit 1 = enable) */
  109. UINT32 eg_cnt; /* global envelope generator counter | need_save */
  110. UINT32 eg_timer; /* global envelope generator counter works at frequency = chipclock/64/3 | need_save */
  111. UINT32 eg_timer_add; /* step of eg_timer */
  112. /* LFO */
  113. UINT32 lfo_cnt; /* need_save */
  114. UINT32 lfo_inc;
  115. UINT32 lfo_freq[8]; /* LFO FREQ table */
  116. } FM_OPN;
  117. /* here's the virtual YM2612 */
  118. typedef struct
  119. {
  120. UINT8 REGS[0x200]; /* registers (for save states) */
  121. INT32 addr_A1; /* address line A1 | need_save */
  122. FM_CH CH[6]; /* channel state */
  123. /* dac output (YM2612) */
  124. int dacen;
  125. INT32 dacout;
  126. FM_OPN OPN; /* OPN state */
  127. UINT32 slot_mask; /* active slot mask (performance hack) */
  128. UINT32 ssg_mask; /* active ssg mask (performance hack) */
  129. } YM2612;
  130. #endif
  131. #ifndef EXTERNAL_YM2612
  132. extern YM2612 ym2612;
  133. #endif
  134. void YM2612Init_(int baseclock, int rate, int ssg);
  135. void YM2612ResetChip_(void);
  136. int YM2612UpdateOne_(int *buffer, int length, int stereo, int is_buf_empty);
  137. int YM2612Write_(unsigned int a, unsigned int v);
  138. //unsigned char YM2612Read_(void);
  139. int YM2612PicoTick_(int n);
  140. void YM2612PicoStateLoad_(void);
  141. void *YM2612GetRegs(void);
  142. void YM2612PicoStateSave2(int tat, int tbt);
  143. int YM2612PicoStateLoad2(int *tat, int *tbt);
  144. #ifndef __GP2X__
  145. #define YM2612Init YM2612Init_
  146. #define YM2612ResetChip YM2612ResetChip_
  147. #define YM2612UpdateOne YM2612UpdateOne_
  148. #define YM2612PicoStateLoad YM2612PicoStateLoad_
  149. #else
  150. /* GP2X specific */
  151. #include "../../platform/gp2x/940ctl.h"
  152. #define YM2612Init(baseclock,rate,ssg) do { \
  153. if (PicoIn.opt&POPT_EXT_FM) YM2612Init_940(baseclock, rate, ssg); \
  154. else YM2612Init_(baseclock, rate, ssg); \
  155. } while (0)
  156. #define YM2612ResetChip() do { \
  157. if (PicoIn.opt&POPT_EXT_FM) YM2612ResetChip_940(); \
  158. else YM2612ResetChip_(); \
  159. } while (0)
  160. #define YM2612UpdateOne(buffer,length,stereo,is_buf_empty) do { \
  161. (PicoIn.opt&POPT_EXT_FM) ? YM2612UpdateOne_940(buffer, length, stereo, is_buf_empty) : \
  162. YM2612UpdateOne_(buffer, length, stereo, is_buf_empty); \
  163. } while (0)
  164. #define YM2612PicoStateLoad() do { \
  165. if (PicoIn.opt&POPT_EXT_FM) YM2612PicoStateLoad_940(); \
  166. else YM2612PicoStateLoad_(); \
  167. } while (0)
  168. #endif /* __GP2X__ */
  169. #endif /* _H_FM_FM_ */